XML 48 R38.htm IDEA: XBRL DOCUMENT v3.8.0.1
Debt - Convertible Senior Notes - Debt Issuance Costs (Details) - Convertible senior notes - 2025 Notes - USD ($)
$ in Thousands
9 Months Ended
Aug. 07, 2017
Sep. 30, 2017
Debt    
Debt issuance costs $ 5,400  
Equity component, reduction to additional paid in capital 1,900  
Liability component, reduction to carrying value of debt $ 3,500  
Interest expense    
Contractual interest expense   $ 722
Amortization of debt issuance costs   69
Amortization of debt discount   834
Total interest expense   $ 1,625